Draft indicating and recording gage.



A. awlLsoN. DRAFT INDICATING A'ND RECORDING GAGE.

APPLICATION FILED 0CT.13, 1915.

Patented Aug. 14, 1917'.

NIT STAT@ PAINT FIFIQE.

ALVAI-I F. WILSON, OF CINCINNATI, OHIO, ASSIGNOR E ONE-HALF T0 JAMES H.IVIGCABE, 0F CINCINNATI, OHIO.

:DRAFT INDICATING v.AND RECORDING GAGE.

Specicaton of Letters Patent.

Patented Aug. 14, 191'?.

To aZZ whom t may concern.'

Be it known that I, ALVAH F. WILSON, a citizen of the United States, andaresident 0f the city of Cincinnati, in the county of Hamilton and Stateof Ohio, have invented certain new and useful Improvements in DraftIndicating and Recording Gages, of which the following is a full, clear,and

exact description, reference being had to h novel construction andarrangement of parts whereby the variations of pressure are indicated onan enlarged scale directly from the variations of height of a column ofliquid without the necessity of any multiplying gears or complicatedmechanism, and in which a very simple and effective means `is provided.

In the drawing,

Figure 1 is a front elevation of my gage with the front door partlybroken away not showing the chimney gage connections.

Fig. 2 is a horizontal section.

Fig. 3 is a vertical section of the operating mechanism for theindicator gage, showing the lever for the recording damper gage, butnone of its connections.

The working parts are inclosed in a box or casing 1, rectangular inshape, and provided with a front door 2 for access to the working parts,and also with a lateral casing 3 for the indicating dial and indicatinghands.

Mounted in the bottom of the case are the two vessels 4, 5, connected bythe tube 6, in which vessels is placed the liquid, preferably oil, 7,adapted to be acted upon by the air suction.

The container 4 is closed at the upper end' and connected by the tube 8with the coupling or nipple 9, which extends through the wall of thecasing, and with which con- MGi-i011 iS made with a draft tube l@ .openEing into the furnace at the point the air suction is to be taken. Theother vessel 5 is open at the top and is provided with a float 12. Thefloat 12 is suspended by the rod 13 pivoted at 15 to the lever arm 14.This lever arm is pivoted to the casing at 16, and extends out laterallythrough the casing 3 behind a sight opening where a dial 17 is providedand where the lever is provided with a pointer 18. The ratio ofdistances between the pointer 18 and the fulcrum of the lever 14 andbetween said fulcrum and the connection with the rod 13 is about 30 to1, so that a very slight movement of the float will be indicated clearlyon the dial.

In order that the gage may be read from either side, as the furnaces maybe arranged in gangs, and a gage provided extending out from the frontface plate for each furnace, the casing has a window 45 on each side,and the scale is imprinted on both sides of the dial. The lever 14 isprovided with an additional pointer 46 for the opposite side of thedial.

The lever arm 14 is provided with a counter weight 19 screwthreaded onthe inner end of the arm so as to adjust the weight with reference tothe float.

.Pivoted to the casing above the lever 14 is a finger arm 2O providedwith a pen or pencil 21, whose point bears on a disk 22 furnished with arecord sheet. The disk is mounted on the central shaft 23 and is drivenslowly by clock work, not shown. The finger 20 is coupled to the leverarm by the connecting bar 24, so that the position of the lever arm asaffected by the movenient of the iioat will be recorded on the recordsheet.

It will be evident that with liquid in the vessels 4 and 5 and the tube6 connecting J[he two vessels, the suction through the draft tube 10will tend to form a vacuum in the vessel 4 and air pressure on the ioatwill cause the float to descend and the pressure to be indicated on thedial and also on the record sheet.

It will also be evident that when in use, evaporation would affect thelevel of the liquid in the pressure vessels, and the result would bethat this would affect the accuracy of the gage.

In order to maintain a constant level and prevent evaporation destroyingthe accuracy of the gage, I provide an accumulator vessel 25 locatedabove the tube 6 and provided with several small openings 27 in thebottom of the vessel opening into the tube. An air opening 28L isprovided through the side of the vessel 25, and the oil or other liquidis poured into this vessel up to the air opening and thus fills thevessels 4 and 5 to the same level. An air tight cap or plunger 28 isprovided for the accumulator, screw threaded on a central pin 29, sothat the cap can be always maintained in a position resting on the oilin the accumulator, and to maintain an air tight fit of the cap, it isprovided with a sealing washer 30.

Small openings 27 are provided for the passage of oil from theaccumulator, so that the movement of the oil into and out of theaccumulator shall be slow to prevent vibrations in the level of theliquid as the level is affected by the air draft. If the oil from theaccumulator had an unobstructed passage into the tube 6, the tendencywould be to cause a momentary raising and lowering of the liquid in theioat chamber until the new level was obtained, caused by the exhaustionof the air from the vessel 4. I have found that the small openingsprevent this tendency to vibration, and I am inclined to believe thatthe result of the small holes is that the accumulator will act as aretarder. I have proven by actual tests, however, that the large holefrom an accumulator causes vibration, and a small one or small ones donot do so.

As the gage is intended for a draft gage in a furnace to determine thatthe grate fire is maintained in proper condition, the fireman mightmaintain a proper level for the gage, not by regulating the fire, but byregulating the damper in the flue. Therefore to record the fact that thedraft through the flue is properly maintained, I provide in connectionwith the draft gage, a similar gage for the draft in the fines. Thevessels 4, 5 and 25 are duplicated in the back of the case at 31, 32 and33, with `an outlet from vessel 32 through the nipple 34 and tube 35 tothe flue. A float 36 is provided connected to the lever 37, pivoted tothe casing and provided with a counterweight 38, and this lever iscoupled by the connecting bar 39 the same having an elbow therein (Fig.2) to the finger 40, carrying a pen or-pencil 41, which also bears onthe record sheet on the disk 22. ,It will be obvious that with thisconstruction the draft in the damper will be also registered on therecord sheet, and by reading both records together it can be determinedwhether there has been Y any manipulation of the fiue dampers, in

order to obtain the proper draft through the grate bars. p

In order that the reman may have ,.SOIIlGf thing to indicate the properpressure to be maintained for the furnace draft, I provide an indicatingpointer 42, mounted on the turn button 43, so that this pointer can beset in the proper position. This pointer shows on each side of the dial,as shown in Fig. 2.

In lsetting up the gage for use, the accumulator is filled with oil tothe air opening and then the cap is screwed down so that the accumulatoris filled with oil without any air space. As I have already pointed out,itis evident. that evaporation would cause a diminution of the amount ofoil or liquid in the device, and this would of course change the levelof the float and the position of the indicating lever. Therefore asevaporation takes place, the cap of the accumulator is given a slightdownward turn to bring Vbaclr the level of the oil in the iioat chamberto the proper position.

Having thus described my invention, what thereon, a scale in the armvisible from both sides thereof, an indicator lever in said arm,pointers on the lever adapted te lie over each side of the scale to showthereupon from both sides of the arm, and a gage in said casing havingliquid reservoirs, and means operated thereby for controlling the lever,whereby said arm may extend out from a furnace for easy reading of theindications.

2. In a device of the character described, the combination with acasing, a laterally extending arm thereon, an indicator in the arm, adraft gage in the casing comprising a closed cylinder having connectionsfor a pipe to a draft flue, an open cylinder hav-l ing a float thereinconnected with the indicator, a passage betweeen said two cylinders, anaccumulator cylinder lcommunicating with said passage for maintaining anoil A level in the cylinders, a recording arm connected to the indicatorarm, a gag'e comprising like cylinders, passages and accumulator set insaid casing alongside of the first mentioned gage, a recording armoperated by said gage, a single chart for both recording l means forminga passageway between them, one receptacle sealed from and the other opento the air, a float for the open Vessel, and means for connecting adraft pipe t0 the closed Vessel, and a liquid in the receptacles adaptedto change its level with variations in the suction on the draft pipe, aninde- Copies of this patent may be obtained for ve cents each, byaddressing the Washington, D. C.

pendent sealed reservoir with liquid to fill the same, there beingpassageways therefrom to the passageway between the receptacles, and anadjustable cap to force the liquid from the reservoir into thereceptacles as the quantity decreases by evaporation. ALVAH F. WILSONCommissioner of Patents,

